POWER RELATIONSHIPS IN A CONTACTLESS A-C MACHINE OPERATING AT VARIABLE SPEED,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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A synchronous-flux machine for generating constant-frequency 3-phase power at variable speed of rotation is analyzed it includes a special frequency changer for supplying the field-current frequency proportional to the rotor slip. The magnetic flux produced by the field current rotates with respect to the open stator winding at a synchronous speed a stationary frequency changer supplies the field winding. This machine is theoretically regarded as a cascade of two symmetrical wound-rotor induction machines its fundamental equations are set up, and formulas for currents, power, and torque under sustained operating conditions are derived. Distribution of the active power depending on the rotor-rpm variation, for S O, s O, s O, is analyzed. It is found that the excitation power is not lost in the machine, but rather is supplied to the line or is taken from the line. It is claimed that the above type of synchronous-flux machine can operate economically as a generator or as a motor.
- Electric Power Production and Distribution